Cosmetic powder bar composition and process for making same

Abstract

A cosmetic powder bar composition is disclosed. The composition, substantially oil free, comprises calcium sulfate dihydrate, mica or mica-containing composite material and polyethylene. A unique process for making this composition is also set forth. In this process a powder phase composition and a liquid phase composition are separately prepared. The two compositions are contacted to form a slurry. The slurry is placed in molds and heated to remove free water therefrom.

What is claimed is: 
     
       1. A cosmetic powder bar composition comprising about 20% to about 40% calcium sulfate dihydrate, about 16% to about 37% mica or mica-containing composite material, and about 0.5% to about 2.4% polyethylene, about 0.5% to about 16% talc, about 1% to about 9.5% calcium carbonate, about 1% to about 20% humectant, about 0.75% to about 4% emulsifier, about 0.1% to about 22.5% colorant, about 0.5% to about 0.75% preservative, and about 0 to about 0.75% of a catalyst which accelerates the reaction of calcium sulfate hemihydrate to calcium sulfate dihydrate at ambient conditions, all said concentrations by weight of the total composition. 
     
     
       2. A composition in accordance with claim 1 wherein said composition comprises between about 22% and about 28 by weight calcium sulfate dihydrate, between about 19% and about 35% by weight mica or mica-containing composite material and between about 5% and about 15% by weight polyethylene. 
     
     
       3. A composition in accordance with claim 2 wherein said composition comprises between about 23% and about 25% by weight calcium sulfate dihydrate, between about 22% and about 29% by weight mica or mica-containing composite material and between about 7% and about 13% by weight polyethylene. 
     
     
       4. A composition in accordance with claim 1 wherein said humectant is glycerin. 
     
     
       5. A composition in accordance with claim 4 wherein said colorant component is selected from the group consisting of iron oxides, titanium dioxide, carmine, chromium oxide greens, chromium hydroxide green, ferric ammonium ferrocyanide, ferric ferrocyanide, ultramarine blue, ultramarine violet, ultramarine pink, manganese violet, FD&C Yellow No. 5 aluminum lake, FD&C Yellow No. 6 aluminum lake, FD&C Blue No. 1 aluminum lake, D&C Red No. 7 calcium lake, D&C Red No. 30 lake and mixtures thereof. 
     
     
       6. A composition in accordance with claim 5 wherein said colorant component is selected from the group consisting of iron oxides, titanium dioxide and mixtures thereof. 
     
     
       7. A composition in accordance with claim 5 wherein said emulsifier is Polysorbate 20. 
     
     
       8. A composition in accordance with claim 7 wherein said preservative component comprises methylparaben, ethylparaben, propylparaben and diazolidinyl urea. 
     
     
       9. A composition in accordance with claim 4 wherein said composition comprises between about 4% and about 12% talc, between about 2% and about 8% calcium carbonate and between about 4% and about 14% glycerin, said percentages being by weight based on the total weight of the composition. 
     
     
       10. A cosmetic powder bar composition comprising between about 23% and about 25% calcium sulfate dihydrate, between about 22% and about 29% mica, between about 7% and about 13% polyethylene, between about 6% and about 10% talc, between about 3.5% and about 7% calcium carbonate, between about 7% and about 12% glycerin, between about 2% and about 3% Polysorbate 20, between about 4% and about 12% colorant, said colorant including titanium dioxide and iron oxides and between about 0.55% and about 0.65% preservative, said preservative including diazolidinyl urea, methylparaben, ethylparaben and propylparaben, said percentages being by weight based on the total weight of the composition.